org.basex.query.expr
Class Catch

java.lang.Object
  org.basex.query.ExprInfo
      org.basex.query.expr.Expr
          org.basex.query.expr.Single
              org.basex.query.expr.Catch

public final class Catch
extends Single

Catch clause.

Author:

Workgroup DBIS, University of Konstanz 2005-09, ISC License, Christian Gruen

Field Summary

Fields inherited from class org.basex.query.expr.Single

expr

Constructor Summary

Catch(Expr ct, QNm[] c, Var v1, Var v2, Var v3)
Constructor.

Method Summary

Iter	iter(QueryContext ctx, QueryException e) Catch iterator.
Expr	remove(Var v) Removes the specified variable in a sub expression.
java.lang.String	toString()
boolean	uses(Expr.Use use, QueryContext ctx) Indicates if an expression uses the specified type.

Methods inherited from class org.basex.query.expr.Single

comp, plan

Methods inherited from class org.basex.query.expr.Expr

addText, atomic, checkCtx, checkDbl, checkItr, duplicates, e, ebv, i, indexAccessible, indexEquivalent, iter, removable, returned, sameAs, size, test

Methods inherited from class org.basex.query.ExprInfo

color, info, name

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Catch

public Catch(Expr ct,
             QNm[] c,
             Var v1,
             Var v2,
             Var v3)

Constructor.

Parameters:

ct - catch expression

c - supported error codes

v1 - first variable

v2 - second variable

v3 - third variable

Method Detail

iter

public Iter iter(QueryContext ctx,
                 QueryException e)
          throws QueryException

Catch iterator.

Parameters:

ctx - query context

e - thrown exception

Returns:

resulting item

Throws:

QueryException - evaluation exception

uses

public boolean uses(Expr.Use use,
                    QueryContext ctx)

Description copied from class: Expr

Indicates if an expression uses the specified type. Called by the compiler to perform certain optimizations. true is returned by default and thus assumed as "worst-case".

Overrides:

uses in class Single

Parameters:

use - use type to be checked

ctx - query context

Returns:

result of check

remove

public Expr remove(Var v)

Description copied from class: Expr

Removes the specified variable in a sub expression.

Overrides:

remove in class Single

Parameters:

v - variable to be removed

Returns:

expression with removed variable

toString

public java.lang.String toString()

Specified by:

toString in class ExprInfo